MINNEAPOLIS (WCCO) – The Marriage Amendment vote will be a closely watched race on Election Tuesday.

A new poll from Public Policy Polling found 45 percent of likely voters support defining marriage as between a man and a woman in the state constitution.

Fifty-two percent say they don’t support it. That’s different from a poll out just last week which showed a dead heat.

With a simple phone call, Cindy Amberger, a volunteer for Minnesota United for All Families, hopes to have an impact on Election Day.

“We’re still helping people know what they need to know,” Amberger said.

She’s one of thousands encouraging people to vote “no” on an amendment defining marriage between a man and woman in Minnesota.

“I think it’s important that we talk to people and let people know how this decision impacts each of us,” she said.

Where a phone call fails, volunteers pick up by canvassing neighborhoods and a statewide RV tour.

Jake Loesch of MUAF believes face-to-face contact is key, especially in the final hours.

“We’re going to continue to rely on it and that’s the tried and true way. It’s really the best way to reach people,” Loesch said.

Those supporting the marriage amendment, like the organization Minnesota for Marriage, are taking the same approach. MFM released an ad on their website Sunday, featuring former local news personality Kalley Yanta.

“We’re grateful to the tens of thousands of volunteers across Minnesota who have devoted their time and talents to help us run the largest grass roots campaign in state history,” Yanta said. “And now the future of marriage is in your hands.”

While voters will make the final decision, it’s the volunteers that could have an impact on the outcome.

The canvassing and phone calls won’t end Monday night. Both sides are expected to be busy until the polls close.